Tuesday, November 22, 2011

What is the equation for percent diffrerences using vector addition and force table experiment.?

I need to know how to calculate the percent difference. I know the general equation, but do not know the variation to use for the vector addition and force table experiment.





I know it needs to be something like %diff (exp-act/act) x 100%





However, with the vector addition experiment, we did not recieve an actual. Is it something that should be obvious?|||I presume you hung some known weights from the table and then experimentally found the weight (and its location) that would balance the known weights. This balancing weight and the angle of its placement are the experimental values.


You can also calculate, algebraically, what the balancing weight should be and where it should be placed. This would be your actual value(s).


OR


You can graphically determine the actual value(s).


Either way these non-experimental methods would be what goes in the "act" part of the error eq.


You could actually have two error eqs. One for the magnitude of the balancing weight and one for the angle of its location.





Note: if you are trying to balance more then one known weight the answer "act" is not obvious and requires calculation.


If you are only trying to balance one known weight then the answer "act" is obvious; equal and opposite.

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